The best way to learn proper English is to read news report, and watch news on TV. Watching TV shows is a great way to learn casual English, slang words, understand culture reference and humor. If you have already watched these shows then you may recall the words used in the following dialogs.

...you always have me,
your SURROGATE family.
The Big Bang Theory Season 3, Episode 11

Using in vitro fertilization
and a SURROGATE uterus...
The Big Bang Theory Season 4, Episode 1

You're my SURROGATE family?
The Big Bang Theory Season 3, Episode 11